Add google drive synchronization

• Add a feature to synchronize data between devices using Google Drive.
• Please refer to the link below for details on how to use it.

Google drive data sync

Move to add word screen

• You can add words after selecting a specific vocabulary.

Other updates

• Add word & vocabulary copy function.
• Update to enable vertical rotation on mobile.
• Improved quiz shortcut stability.
• Changed dictation scoring algorithm.
• Toast message improvement.
  • Messages without actions can be dragged by clicking anywhere!